The adult human jawbone, or mandible, arises embryonically from a gill arch. The arch and the mandible are said to be ________.

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Homologous structures refer to structures that have a similar evolutionary origin and may or may not have the same function in different species. In this case, the mandible and the gill arch share a common ancestry, making them homologous structures.

The Adult Human Jawbone, or Mandible, Arises Embryonically from a Gill